Adding multiple maps in Garmin Nuvi 255w GPS
This is example device some other devices use similar names
Theoretically, the Garmin Nuvi GPS navigator can be loaded with hundreds of map
The maps are stored in specific mapset files with *.img extension in the flash memory of the GPS unit. Each mapset file contains one or many maps in it. Beside that, the Garmin GPS navigator can also recognise and load up one additional mapset ...